Hello

I was breaking yesterday with engine before roundabout when suddenly bike start to make loud metallic bangs and engine stopped. I can't start bike again.You can push the bike on Neutral and changing the gears seems to be working. I have noticed that engine sound is slightly different last few days but it was so subtle that I was thinking it is just my imaginations. I have checked oil two days ago and all was fine.
Bike usually puffs when you breaking with engine and it did it yesterday as well but puff immediately change to big bangs. I think that engine blows up but I just want to check with you guys if anyone have any other idea that may give me little hope to use this bike again? I do not have money at the moment to replace engine ☹

Thanks